High-Entropy Surface Complex Stabilized LiCoO2 Cathode

被引:55
作者
Tan, Xinghua [1 ,2 ]
Zhang, Yongxin [1 ,3 ]
Xu, Shenyang [2 ]
Yang, Peihua [4 ]
Liu, Tongchao [5 ]
Mao, Dongdong [1 ]
Qiu, Jimin [2 ]
Chen, Zhefeng [2 ]
Lu, Zhaoxia [3 ]
Pan, Feng [2 ]
Chu, Weiguo [1 ]
机构
[1] Natl Ctr Nanosci & Technol, Nanofabricat Lab, CAS Key Lab Nanophoton Mat & Devices, Beijing 100190, Peoples R China
[2] Peking Univ, Sch Adv Mat, Shenzhen Grad Sch, Shenzhen 518055, Peoples R China
[3] Guangxi Univ, Sch Chem & Chem Engn, Nanning 530004, Peoples R China
[4] Wuhan Univ, Inst Technol Sci, MOE Key Lab Hydrodynam Transients, Wuhan 430072, Peoples R China
[5] Argonne Natl Lab, Chem Sci & Engn Div, Lemont, IL 60439 USA
基金
中国博士后科学基金;
关键词
high-voltage LiCoO2; high-entropy complex; Li-ion batteries; Mg-Al-Eu co-doping; oxygen evolution; LITHIUM COBALT OXIDE; LAYERED OXIDE; VOLTAGE; ELEMENTS;
D O I
10.1002/aenm.202300147
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Elevating the charge voltage of LiCoO2 increases the energy density of batteries, which is highly enticing in energy storage implementation ranging from portable electronics to e-vehicles. However, hybrid redox reactions at high voltages facilitate oxygen evolution, electrolyte decomposition and irreversible phase change, and accordingly lead to rapid battery capacity decay. Here significantly improved high-voltage cycling stability of Mg-Al-Eu co-doped LiCoO2 is demonstrated. It is found that element co-doping induces a near-surface high-entropy zone, including an innately thin disordered rock-salt shell and a dopant segregation surface. The high-entropy complex can effectively suppress oxygen evolution and near-surface structure deconstruction. The phase change reversibility between O3 and H1-3 and thermal stability of the cathode are greatly enhanced as well. As a result, the co-doped LiCoO2 exhibits a remarkable cycling performance, retaining 86.3% and 72.0% of initial capacity over 800 and 2000 cycles, respectively, with a high cut-off voltage of 4.6 V. The feasible co-doping approach broadens the perspective for the development of stable lithium-ion batteries with high operating voltages.
引用
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页数:10
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